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AK4397 Datasheet, PDF (35/37 Pages) Asahi Kasei Microsystems – High Performance Premium 32-Bit DAC | |||
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[AK4397]
It is recommended for SACD format book (Scarlet Book) that the filter response at SACD playback is an analog low pass
filter with a cut-off frequency of maximum 50kHz and a slope of minimum 30dB/Oct. The AK4397 can achieve this filter
response by combination of the internal filter (Table 17) and an external filter (Figure 19).
Frequency
Gain
20kHz
â0.4dB
50kHz
â2.8dB
100kHz
â15.5dB
Table 17. Internal Filter Response at DSD mode
AOUT-
2.0k
2.8Vpp
2200p
2.0k
AOUT+
2.8Vpp
1.8k
3300p
1.8k
4.3k
4.3k
1.0k
1.0k
270p
270p
+Vop
-
+
-Vop
Analog
Out
6.34Vpp
Figure 19. External 3rd order LPF Circuit Example for DSD
Frequency
Gain
20kHz
â0.05dB
50kHz
â0.51dB
100kHz
â16.8dB
DC gain = 1.07dB
Table 18. 3rd order LPF (Figure 19) Response
MS0616-E-00
- 35 -
2007/05
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